The heart muscle is nourished by:
Correct answer: C. Coronary artery
- A. Pulmonary artery
- B. Right atrium
- C. Coronary artery
- D. Left atrium
Explanation
The heart muscle is nourished by coronary arteries. The coronary arteries are a network of blood vessels that supply oxygen-rich blood to the heart muscle. There are two main coronary arteries: the right coronary artery and the left main coronary artery. The right coronary artery supplies blood to the right side of the heart, including the right atrium, the right ventricle, and the right coronary artery itself. The left main coronary artery divides into two branches: the left anterior descending artery (LAD) and the left circumflex artery (LCX). The LAD supplies blood to the front and bottom of the heart, including the left atrium, the left ventricle, and the interventricular septum (the wall that separates the left and right ventricles).
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The human digestive system covers the organs from mouth to anus, the movement of food, and the mechanical and chemical breakdown of carbohydrates, proteins and fats. It also includes the roles of digestive enzymes, bile, absorption through intestinal villi, and the assimilation of nutrients by body cells.
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